PeterDonis's latest activity
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PeterDonis replied to the thread Graduate Applicability of Spin-2 Field Interpretation of GR.That was how the spin-2 field theory was first investigated in the 1960s. However, it took quite a few years to realize that the theory... -
PeterDonis replied to the thread Undergrad Simplified Special Relativity: Looking to get roasted on this.Moderator's note: Two subthreads have now been spun off into separate threads...
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PeterDonis replied to the thread Undergrad Simplified Special Relativity: Looking to get roasted on this.Thread closed for moderation.
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PeterDonis replied to the thread Undergrad Simplified Special Relativity: Looking to get roasted on this.It is if the assumptions are someone's personal theory. Discussion of personal theories is off limits here. If they appear in a valid...
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PeterDonis replied to the thread Undergrad Some notes on LET for reference.What would that even mean? You don't make predictions using "principles". You make them using a well-defined mathematical model. LET's...
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PeterDonis replied to the thread Simple kinematics problem — falling from a geostationary satellite.Thread closed for moderation.
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PeterDonis replied to the thread Undergrad Particles' Intrinsic Properties in QFT.The problem is that there is no single mathematical object that is referred to by "its four-momentum". Physicists, with their usual...
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PeterDonis replied to the thread Undergrad Some notes on LET for reference.I'm not sure I would put it that way. SR explains the speed of light experimental results by saying they are a consequence of the...
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PeterDonis replied to the thread Undergrad Particles' Intrinsic Properties in QFT.But such properties aren't properties of the particle alone; they're properties of the particle combined with a particular choice of...
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PeterDonis reacted to bhobba's post in the thread Undergrad Particles' Intrinsic Properties in QFT with
Like.
Interestingly, in the non-relativistic limit of QFT, they still remain operators. It is possible to formally recover the states of... -
PeterDonis reacted to Dale's post in the thread Undergrad The invariance of the speed of light is not only a hypothesis? with Like.
This is an absolutely silly objection. You object to the use of a synchronization convention in BU, and assert that the use of such a...
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PeterDonis reacted to Ibix's post in the thread Simple kinematics problem — falling from a geostationary satellite with Like.
Sure. You calculate the velocity from the change in GPE, then adjust the launch angle so that ##v\sin(\theta)## (or ##v\cos(\theta)##...
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PeterDonis reacted to Dale's post in the thread Undergrad Simplified Special Relativity: Looking to get roasted on this with Like.
Not really. The classic example of a non-falsifiable theory is “God willed it so”. It fits all the observations perfectly. The goal...
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PeterDonis reacted to martinbn's post in the thread Undergrad Simplified Special Relativity: Looking to get roasted on this with Like.
@DavidMiranda I have to say that I misunderstood you. I thought you had been doing some calculations (to understand things better or...
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PeterDonis replied to the thread Simple kinematics problem — falling from a geostationary satellite.If you want the path to be radial in an Earth-centered inertial frame, launching from the rotating Earth, you need to fire it backwards...